1、Designation: D5642 09An American National StandardStandard Test Method forSealed Tube Chemical Compatibility Test1This standard is issued under the fixed designation D5642; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o
2、f last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers procedures for evaluating theinteraction of electrical insulation components used, or in-te
3、nded to be used, in electrical insulation systems.1.2 This test method is useful for determining compatibilitybut additional testing may be required depending upon appli-cation.1.3 This test method may also provide useful informationabout the behavior of selected insulating materials whencompared to
4、 a reference value as opposed to a referencesystem.1.4 This test method does not cover systems which operatein liquids or gases other than air.1.5 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.6 This standard does not purpor
5、t to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. See also 8.2.4,8.3.1 and 8.3.2.12. Referenced D
6、ocuments2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD1676 Test Methods for Film-Insulated Magnet WireD1711 Terminology Relating to Electrical Insulation3. Terminology3.1 Definition
7、s:3.1.1 magnet wireSee Terminology D1711 for the defini-tion of this term.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging test, na process of exposure, to a specified setof conditions for a defined period of time, which results in anirreversible change in one or more physical, chemica
8、l, electri-cal, or thermal characteristics of a material.3.2.2 candidate system, nthe proposed electrical insula-tion system to be evaluated.3.2.3 electrical insulation system, nan intimate combina-tion of insulating materials with conductors, as used in elec-trical equipment.3.2.4 insulation system
9、 class, na standardized designationof the temperature capability of the electrical insulation sys-tem. It is expressed by both numbers and letters as follows:System Class105 (A)120 (E)130 (B)155 (F)180 (H)200 (N)220 (R)240 (S)3.2.5 reference system, nan electrical insulation systemwhich has been pre
10、viously evaluated and found acceptable.3.2.6 twisted pair, nfilm-insulated round magnet wire thathas been prepared in accordance with Test Methods D1676.4. Summary of Test Method4.1 Acombination of specific materials is sealed in a limitedspace and subjected to a specific elevated temperature for as
11、pecified time. Following this exposure the dielectric break-down voltage of the insulated conductors is used as a basis forjudging the compatibility of the candidate system.5. Significance and Use5.1 This test method is useful for evaluating a combinationof materials for potential use in an electric
12、al insulation system.6. Apparatus6.1 Oven, capable of maintaining the required exposuretemperature within 63 C.6.2 Glass Tubes with inside volume not exceeding 900 mLthat can be sealed. Two general types are described as follows:1This test method is under the jurisdiction of ASTM Committee D09 onEle
13、ctrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.17 on Thermal Characteristics.Current edition approved Oct. 1, 2009. Published November 2009. Originallyapproved in 1994. Last previous edition approved in 2004 as D5642 99(2004).DOI: 10.1520/D5642-09.2Fo
14、r referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standa
15、rd.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2.1 Flanged High Temperature Glass Tubes which aredesigned to be sealed with metal rings and gaskets arepreferred.6.2.2 Glass Tubes, which can be fusion sealed after theaddition of
16、all materials are acceptable alternatives.6.3 Gasket Materials for use with tubes described in 6.2.1.6.3.1 Type TFE (Tetrafluoroethylene) or FEP (Perfluoroet-hylene Propylene) Fluorocarbon.6.3.2 Hexafluoropropylenevinylidene fluoride elastomercan be used for exposure temperatures not exceeding 155 C
17、.6.4 Apparatus in conformance with Test Method D149 tomeasure dielectric breakdown voltage.7. Material Specimens7.1 The specific list of materials to be tested is to beestablished by agreement between interested parties.7.2 Represent each of the non-metallic components of theelectrical insulation sy
18、stem, with the exception of an impreg-nating varnish and insulated conductors, with a specimenhaving a minimum mass of 250 mg.7.3 Insulated Conductor Specimens:7.3.1 Use film insulated magnet wire twisted pairs con-structed in accordance with Test Methods D1676;18AWGheavy build is preferred.7.3.2 Fo
19、r conductors not suitable for constructing twistedpairs, use specimens having a minimum length of 200 mm.NOTE 1An example of conductors not suitable for constructingtwisted pairs is fibrous wrapped conductors. They shall be represented asdescribed in 7.3.2.7.4 Apply impregnating varnish to the insul
20、ated conductorsand cure per manufacturers recommendations.8. Procedures8.1 Tube Loading and Sealing:8.1.1 Clean and dry tubes as needed prior to use.8.1.2 Prepare one tube with the materials that represent thereference system. Insert all materials as specified in Section 7into the tube. For each mag
21、net wire type insert a minimum offive twisted pairs or three straight lengths prepared in accor-dance with Section 7.NOTE 2It is acceptable to place a stainless steel screen as a barrier torestrict physical contact of the insulated conductors from the othermaterials in the tube, to avoid damage to t
22、he insulated conductorspecimens.8.1.3 Prepare one tube for each candidate system in thesame manner in which the reference system tube was prepared.8.1.4 Condition each unsealed tube and its contents for 1 hat 105 C. The purpose of this procedure is to minimize themoisture content of all materials in
23、 the tube. It is an acceptableprocedure to condition materials outside the tube to allowsufficient drying prior to 8.1.2 and 8.1.3. Concurrently condi-tion tubes and gaskets.8.1.5 Certain materials, including but not limited to hygro-scopic papers, may require additional conditioning to removemoistu
24、re. If agreed upon by interested parties, higher tempera-tures and times for drying may be used. Select a time andtemperature that do not cause loss of other volatile materials orcause thermal decomposition.8.1.6 Seal tubes within 3 min after conditioning, and leaktest immediately thereafter in acco
25、rdance with 8.1.6.2.8.1.6.1 Seal flanged glass tubes by applying a sufficienttorque to ensure a seal that is leak free.Atorque of 3.4 Nm (30inch-pounds) in increments of 0.56 Nm (5 inch-pounds),alternating between bolts to tighten evenly and securely hasbeen found acceptable for this purpose.8.1.6.2
26、 Check glass tubes for leaks using the followingprocedure: Submerge the still warm tubes into room tempera-ture tap water for a minimum of 2 min. Observe the tubes afterthey have reached room temperature for condensation on theinner walls. Condensation is a result of leakage.8.1.6.3 Do not use tubes
27、 that exhibit leakage.8.2 Aging:8.2.1 Place the tubes into an oven that is at room tempera-ture.8.2.2 Apply power to the oven and allow it to attain theaging temperature.8.2.2.1 Sealed tubes may be placed into a heated oven, butit should be recognized that the thermal shock will causestresses that m
28、ay result in cracking of the glass tubes. Do notuse any tubes that crack as a result of such treatment.8.2.3 The aging temperature shall be 25C greater than thenumerical insulation system class of the reference system.8.2.4 After a minimum of 336 h exposure to the agingtemperature, remove the tubes
29、from the oven.As an alternative,to reduce the extent of thermal shock, turn off the power to theoven and allow the oven and tubes to cool to room temperature.(WarningUse protective equipment including safety glassesor face shield and high temperature gloves when handlingheated glass tubes. Glass tub
30、es may shatter upon beingsubjected to thermal shock.)8.3 Procedures for Testing:8.3.1 Open the tubes within 72 h of the completion of aging.Remove the insulated conductor specimens. (WarningUseadequate ventilation when opening the tubes. Fumes emittedfrom the tube may be toxic.)8.3.2 Determine the d
31、ielectric breakdown voltage of twistedpair conductors in accordance with Test Methods D1676.8.3.2.1 Warning Lethal voltages may be present duringthis test. It is essential that the test apparatus, and allassociated equipment that may be electrically connected to it,be properly designed and installed
32、 for safe operation. Solidlyground all electrically conductive parts that any person mightcome in contact with during the test. Provide means for use atthe completion of any test to ground any parts which: were athigh voltage during the test; may have acquired an inducedcharge during the test; may r
33、etain a charge even afterdisconnection of the voltage source. Thoroughly instruct alloperators in the proper way to conduct tests safely. Whenmaking high voltage tests, particularly in compressed gas or inoil, the energy released at breakdown may be suffcient to resultin fire, explosion, or rupture
34、of the test chamber. Design testequipment, test chambers, and test specimens so as to minimizethe possibility of such occurrences and to eliminate thepossibility of personal injury.8.3.3 For straight conductor specimens prepare electrodesby applying 6 mm wide thin metal foil to the center of a 13 mm
35、D5642 092wide, 75 mm long strip of pressure sensitive tape. Apply twoelectrodes at right angles to each specimen at intervals approxi-mately13 the length of the specimen and wrap smoothly andfirmly around the specimen a minimum of 1 and12 completeturns, with the metal surface of the foil in contact
36、with theinsulation.8.3.4 Modification of electrode configuration may be nec-essary for specific applications: Such modification shall be asagreed between interested parties.8.3.5 Record the results.9. Interpretation of Results9.1 For each type of conductor taken from each tube,calculate the average
37、of at least five dielectric breakdownvoltage values using all of the dielectric breakdown voltagesobtained. The criteria to be used for eliminating any onedielectric breakdown voltage value from the calculation of theaverage is to be determined by agreement between interestedparties prior to testing
38、.9.2 A comparison of the average dielectric breakdownvoltage values obtained for the conductor specimens takenfrom the candidate and reference tubes is the basis fordetermining the compatibility of the materials in a candidatesystem. The maximum acceptable difference between theaverage values shall
39、be established by agreement betweeninterested parties.10. Report10.1 Report the following information:10.1.1 Designation and description of the reference andcandidate system including all components,10.1.2 Pre-conditioning or drying conditions,10.1.3 Aging temperature, and10.1.4 Length of exposure t
40、ime.10.1.5 For each type of conductor taken from each tube,10.1.5.1 Individual dielectric breakdown voltage values,and10.1.5.2 Average dielectric breakdown voltage value.11. Precision and Bias11.1 No statement is made about either the precision or biasof this test method since the result merely stat
41、es whether thereis conformance to the criteria for acceptability defined in termsof this test method.12. Keywords12.1 chemical compatibility; electrical insulation system;sealed tubeSUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this test method since the last iss
42、ue,D5642 99(2004), that may affect the use of this test method. (Approved October 1, 2009)(1) Revised 8.1.6.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised t
43、hat determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapp
44、roved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you
45、feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D5642 093
